A method for beneficiating potassium feldspar phenocryst

Abstract

The invention discloses a potassium feldspar phenocryst beneficiation method, which relates to the technical field of potassium feldspar beneficiation; specifically comprises the following steps: step 1: potassium feldspar ore crushing; using a jaw crusher to preliminarily crush the mined potassium feldspar ore to obtain potassium feldspar crushed material; step 2: grinding the potassium feldspar crushed material; using a rod mill and a drum screen to preliminarily grind the potassium feldspar crushed material, and then removing fine clay impurities through a cyclone and a spiral classifier to obtain a potassium feldspar primary abrasive; then using a ball mill to perform secondary grinding on the potassium feldspar primary abrasive to obtain a potassium feldspar secondary abrasive; step 3: potassium feldspar secondary abrasive washing and desliming; step 4: separating potassium feldspar. The invention uses an ultrasonic cleaner and a sedimentation centrifuge to clean and separate iron minerals, biotite, tourmaline and potassium feldspar, thereby improving the beneficiation efficiency of potassium feldspar ore, and does not need to filter and screen the potassium feldspar ore multiple times, thereby reducing the difficulty of beneficiation.

Description

Technical Field

[0001] The invention relates to the technical field of potassium feldspar beneficiation, and in particular to a potassium feldspar phenocryst beneficiation method. Background Art

[0002] Potassium feldspar phenocrysts refer to potassium feldspar existing in the form of phenocrysts in rocks. Potassium feldspar phenocrysts are usually single crystals or aggregates composed of several irregular or fan-shaped crystals, with the characteristics of Carr-Schmidt twins. Potassium feldspar phenocrysts often coexist with minerals such as quartz, biotite and hornblende in rocks to form a specific mineral combination.

[0003] After searching, the Chinese patent application No. 202311668237.2 discloses a potassium feldspar phenocryst beneficiation method, comprising the following steps: 1) using a machine to mine weathered porphyritic medium-grained monzogranite ore and crush it; 2) screening and washing the crushed ore to obtain potassium feldspar phenocrysts; 3) using a mill to grind the potassium feldspar phenocrysts in step 2) to obtain a grinding material; 4) using a 0.6*0.6mm sieve to screen the grinding material to obtain a primary screening material, and the slag that does not pass through the sieve enters the mill in step 3) for re-grinding; 5) The primary screened material is subjected to primary magnetic separation by means of weak magnetic separation to remove magnetite and obtain primary magnetic separation material; 6) The primary magnetic separation material is subjected to screening by means of a 0.1*0.1 mm screen to obtain a secondary screened material; 7) The secondary screened material is subjected to screening by means of a 0.03*0.03 mm screen to remove ore slime and obtain a tertiary screened material; 8) The tertiary screened material is subjected to two passes of high gradient magnetic separation to remove tailings and obtain a potassium feldspar concentrate; 9) The upper layer material that does not pass through the screen in step 6) is subjected to two passes of strong magnetic separation after filtering and drying to remove tailings and middlings and obtain a potassium feldspar concentrate.

[0004] The potassium feldspar phenocryst beneficiation method in the above patent has the following shortcomings: in actual use, the beneficiation method needs to screen the ore abrasive multiple times through sieves of various sizes, which reduces the beneficiation speed of potassium feldspar. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a potassium feldspar phenocryst beneficiation method.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A potassium feldspar phenocryst beneficiation method comprises the following steps:

[0008] Step 1: crushing potassium feldspar ore: using a jaw crusher to preliminarily crush the mined potassium feldspar ore to obtain potassium feldspar crushed material;

[0009] Step 2: grinding the potassium feldspar crushed material; using a rod mill and a drum screen to grind the potassium feldspar crushed material preliminarily, and then removing fine clay impurities through a cyclone and a spiral classifier to obtain potassium feldspar primary abrasive; then using a ball mill to grind the potassium feldspar primary abrasive for secondary grinding to obtain potassium feldspar secondary abrasive;

[0010] Step 3: washing and desludging the potassium feldspar secondary abrasive; ultrasonic cleaning is performed on the potassium feldspar secondary abrasive by using an ultrasonic cleaner to separate clay, fine mud, mica, iron minerals, biotite, tourmaline and potassium feldspar; during the ultrasonic cleaning process, clean water is continuously injected into the ultrasonic cleaning tank so that the overflowing water flow takes away the clay, fine mud and mica; after the cleaning is completed, drainage is performed to obtain potassium feldspar washed ore material; finally, the potassium feldspar washed ore material is mixed with three times the amount of clean water to obtain a mixture, which is injected into a centrifuge for centrifugal separation; after the mixture is completely static, water is extracted from the top of the centrifugal bin to obtain a potassium feldspar layered material, and the potassium feldspar is at the upper part of the mixture;

[0011] Step 4: Separating potassium feldspar; extracting potassium feldspar from the upper layer of potassium feldspar layered material by a negative pressure extractor, and then magnetically separating the upper layer of potassium feldspar by a high gradient magnetic separator to remove iron minerals, biotite, and tourmaline, to obtain a group of potassium feldspar concentrates; then concentrating other material layers in the potassium feldspar layered material, mixing the other material layers after multiple centrifugations to obtain a secondary selected mixed material, and magnetically separating the secondary selected mixed material by a high gradient magnetic separator to remove iron minerals, biotite, and tourmaline, to obtain two groups of potassium feldspar concentrates;

[0012] Step 5: Dehydration and drying of potassium feldspar concentrate; mixing one group of potassium feldspar concentrate and the second group of potassium feldspar concentrate, enriching and dehydrating the potassium feldspar concentrate through a concentrator and a filter press to obtain potassium feldspar concentrate wet material, and then drying the potassium feldspar concentrate wet material through a drum dryer to obtain potassium feldspar concentrate dry material.

[0013] Preferably: in the step, the particle diameter of the potassium feldspar crushed material is less than or equal to 18 mm.

[0014] Further: in the step 2, the particles of the primary potassium feldspar abrasive completely pass through a 20-mesh sieve, and the particles of the secondary potassium feldspar abrasive completely pass through a 100-mesh sieve.

[0015] As a preferred embodiment of the present invention: the ultrasonic cleaner in step three is a low-frequency cleaner, and its operating frequency is 20KHz-28KHz.

[0016] On the basis of the above scheme: the centrifuge in step three is a decanter centrifuge, and its operating speed is 4000 revolutions per minute.

[0017] Preferably: the high gradient magnetic separator in step 4 is a water separation strong magnetic separator, and the negative pressure extractor is configured as a negative pressure multi-point suction system.

[0018] Further: the concentrator and filter press in step 5 make the humidity of the first group of potassium feldspar concentrate and the second group of potassium feldspar concentrate less than or equal to 15%, and the drum dryer makes the humidity of the first group of potassium feldspar concentrate and the second group of potassium feldspar concentrate less than or equal to 1%.

[0019] The beneficial effects of the present invention are:

[0020] The potassium feldspar phenocryst beneficiation method uses an ultrasonic cleaner and a sedimentation centrifuge to clean and separate iron minerals, biotite, tourmaline and potassium feldspar, thereby improving the beneficiation efficiency of potassium feldspar ore, eliminating the need for multiple filtration and sieving of the potassium feldspar ore, and reducing the difficulty of beneficiation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a flow chart of the potassium feldspar phenocryst beneficiation method. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] A potassium feldspar phenocryst beneficiation method, such as Figure 1 As shown, the following steps are included:

[0025] Step 1: Crushing of potassium feldspar ore: Use a jaw crusher to preliminarily crush the mined potassium feldspar ore to obtain potassium feldspar crushed material; the jaw crusher is set as a fine jaw crusher (PEX series), and the discharge particle size range is between 18-90 mm. By adjusting the discharge port, the particle diameter of the potassium feldspar crushed material is less than or equal to 18 mm, which is convenient for subsequent processing.

[0026] Step 2: grinding the potassium feldspar crushed material; using a rod mill and a drum screen to grind the potassium feldspar crushed material preliminarily, and then removing fine clay impurities through a cyclone and a spiral classifier to obtain potassium feldspar primary abrasive; then using a ball mill to grind the potassium feldspar primary abrasive for secondary grinding to obtain potassium feldspar secondary abrasive.

[0027] The rod mill is set as an overflow type rod mill, and the particles of the first-level potassium feldspar abrasive completely pass through a 20-mesh screen, that is, the particle diameter of the first-level potassium feldspar abrasive is less than or equal to 0.85 mm; the cyclone is set as a desludging cyclone, and the spiral classifier is set as a high weir type, and the two cooperate to separate the clay and mud produced after the potassium feldspar crushing material is ground.

[0028] The ball mill is set as an energy-saving ball mill and is set to wet grinding. The particles of the potassium feldspar secondary abrasive completely pass through a 100-mesh screen, that is, the particle diameter of the potassium feldspar secondary abrasive is less than or equal to 0.15 mm.

[0029] Step 3: Washing and desludging of potassium feldspar secondary abrasive; ultrasonic cleaning is performed on the potassium feldspar secondary abrasive by an ultrasonic cleaner. The ultrasonic cleaner is a low-frequency cleaner with an operating frequency of 20KHz-28KHz. The cavitation bubbles generated by low-frequency ultrasonic waves in the cleaning water flow are large and have a strong impact force, which separates clay, fine mud, mica, iron minerals, biotite, tourmaline from potassium feldspar to form independent substances, thereby avoiding the adhesion of different types of substances and affecting the subsequent mineral processing work.

[0030] During the ultrasonic cleaning process, clean water is continuously injected into the ultrasonic cleaning tank so that the overflowing water can carry away clay, fine mud and mica. After the overflowing water is filtered by a 500-mesh filter, it is injected into the ultrasonic cleaning tank again to achieve water circulation and avoid waste of water resources.

[0031] After the cleaning is completed, the drainage is carried out. The ultrasonic cleaner has a built-in 300-mesh filter box. After the drainage is completed, the filter box obtains potassium feldspar washing material.

[0032] Finally, the potassium feldspar washed material is mixed with three times the amount of clean water to obtain a mixture, which is injected into a centrifuge for centrifugal separation. The centrifuge is a sedimentation centrifuge with an operating speed of 4000 revolutions per minute and a centrifugal time of 10-30 minutes to separate the iron minerals, biotite, tourmaline and potassium feldspar.

[0033] After the centrifugal work is completed, wait for the mixture to completely come to a standstill, then extract the water flow from the top of the centrifugal bin to obtain the potassium feldspar stratified material, with the potassium feldspar being at the upper part of the mixture.

[0034] The density of potassium feldspar phenocryst is 2.54-2.57g / cm 3 , the density of quartz is 2.65g / cm 3 The density of biotite is 2.7-3.3g / cm 3 , the density of tourmaline is 3.0-3.2g / cm 3 The density of potassium feldspar phenocrysts is the smallest. After centrifugation, iron minerals, biotite, tourmaline and potassium feldspar are layered inside the centrifugal chamber, which are potassium feldspar layer, quartz layer, biotite layer and tourmaline layer from top to bottom.

[0035] Step 4: Separating potassium feldspar; extracting the upper potassium feldspar of the potassium feldspar stratified material through a negative pressure extractor, and then magnetically separating the upper potassium feldspar through a high gradient magnetic separator to remove iron minerals, biotite and tourmaline, to obtain a group of potassium feldspar concentrates.

[0036] Then, other material layers in the potassium feldspar stratified material are concentrated, and other material layers after multiple centrifugations are mixed to obtain a secondary mixed material, and the secondary mixed material is magnetically separated by a high gradient magnetic separator to remove iron minerals, biotite and tourmaline to obtain two groups of potassium feldspar concentrates.

[0037] High gradient magnetic separator is a water separation strong magnetic machine. The magnetic system of high gradient magnetic separator is made of high quality ferrite material or composite with rare earth magnetic steel. The average magnetic induction intensity of the magnetic roller surface is 100-600mT.

[0038] The negative pressure extractor is set as a negative pressure multi-point suction system, which forms negative pressure (vacuum) in the conveying pipeline through a vacuum pump, thereby adsorbing the potassium feldspar layer and conveying it to the inside of the high gradient magnetic separator.

[0039] Step 5: dehydrating and drying the potassium feldspar concentrate; mixing the first group of potassium feldspar concentrate and the second group of potassium feldspar concentrate, enriching and dehydrating them through a concentrator and a filter press to obtain potassium feldspar concentrate wet material, and the concentrator and the filter press make the moisture of the first group of potassium feldspar concentrate and the second group of potassium feldspar concentrate less than or equal to 15%; then drying the potassium feldspar wet material through a drum dryer to obtain potassium feldspar concentrate dry material, and the drum dryer makes the moisture of the first group of potassium feldspar concentrate and the second group of potassium feldspar concentrate less than or equal to 1%.

[0040] The potassium feldspar phenocryst beneficiation method does not require multiple filtration and screening of potassium feldspar ore, thereby reducing the difficulty of beneficiation. At the same time, an ultrasonic cleaner and a sedimentation centrifuge are used to clean and separate iron minerals, biotite, tourmaline and potassium feldspar, thereby improving the beneficiation efficiency of the potassium feldspar ore. At the same time, the potassium feldspar concentrate obtained by the method has a K2O content of 10.32% to 10.81%, which is a very high-quality potassium feldspar product.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for beneficiating potassium feldspar phenocrysts, characterized in that: The following steps are involved: Step 1: crushing of potassium feldspar ore; The mined potassium feldspar ore is preliminarily crushed by a jaw crusher to obtain potassium feldspar crushed material; Step 2: grinding the potassium feldspar crushed material; using a rod mill and a drum screen to grind the potassium feldspar crushed material preliminarily, and then removing fine clay impurities through a cyclone and a spiral classifier to obtain potassium feldspar primary abrasive; then using a ball mill to grind the potassium feldspar primary abrasive for secondary grinding to obtain potassium feldspar secondary abrasive; Step 3: washing and desludging the potassium feldspar secondary abrasive; ultrasonic cleaning is performed on the potassium feldspar secondary abrasive by using an ultrasonic cleaner to separate clay, fine mud, mica, iron minerals, biotite, tourmaline and potassium feldspar; during the ultrasonic cleaning process, clean water is continuously injected into the ultrasonic cleaning tank so that the overflowing water flow takes away the clay, fine mud and mica; after the cleaning is completed, drainage is performed to obtain potassium feldspar washed ore material; finally, the potassium feldspar washed ore material is mixed with three times the amount of clean water to obtain a mixture, which is injected into a centrifuge for centrifugal separation; after the mixture is completely static, water is extracted from the top of the centrifugal bin to obtain a potassium feldspar layered material, and the potassium feldspar is at the upper part of the mixture; Step 4: Separating potassium feldspar; extracting potassium feldspar from the upper layer of potassium feldspar layered material by a negative pressure extractor, and then magnetically separating the upper layer of potassium feldspar by a high gradient magnetic separator to remove iron minerals, biotite, and tourmaline, to obtain a group of potassium feldspar concentrates; then concentrating other material layers in the potassium feldspar layered material, mixing the other material layers after multiple centrifugations to obtain a secondary selected mixed material, and magnetically separating the secondary selected mixed material by a high gradient magnetic separator to remove iron minerals, biotite, and tourmaline, to obtain two groups of potassium feldspar concentrates; Step 5: Dehydration and drying of potassium feldspar concentrate; mixing one group of potassium feldspar concentrate and the second group of potassium feldspar concentrate, enriching and dehydrating the potassium feldspar concentrate through a concentrator and a filter press to obtain potassium feldspar concentrate wet material, and then drying the potassium feldspar concentrate wet material through a drum dryer to obtain potassium feldspar concentrate dry material.

2. A potassium feldspar phenocryst beneficiation method according to claim 1, characterized in that: In the step, the particle diameter of the potassium feldspar crushed material is less than or equal to 18 mm.

3. A potassium feldspar phenocryst beneficiation method according to claim 1, characterized in that: In the step 2, the particles of the primary potassium feldspar abrasive completely pass through a 20-mesh sieve, and the particles of the secondary potassium feldspar abrasive completely pass through a 100-mesh sieve.

4. A potassium feldspar phenocryst beneficiation method according to claim 1, characterized in that: The ultrasonic cleaner in step three is a low-frequency cleaner, and its operating frequency is 20KHz-28KHz.

5. The method for beneficiating potassium feldspar phenocrysts according to claim 1, characterized in that: The centrifuge in step 3 is a decanter centrifuge, and its operating speed is 4000 revolutions per minute.

6. A potassium feldspar phenocryst beneficiation method according to claim 1, characterized in that: The high gradient magnetic separator in step 4 is a water separation strong magnetic separator, and the negative pressure extractor is configured as a negative pressure multi-point suction system.

7. A potassium feldspar phenocryst beneficiation method according to claim 1, characterized in that: The concentrator and filter press in step 5 make the moisture of the first group of feldspar concentrate and the second group of feldspar concentrate less than or equal to 15%, and the drum dryer makes the moisture of the first group of feldspar concentrate and the second group of feldspar concentrate less than or equal to 1%.

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